First-passage and last-passage algorithms, which are two diffusion Monte Carlo methods, can obtain charge density on a conducting surface. In general, the first-passage algorithms have been used to obtain the capacitance of the arbitrary-shaped conductors. In contrast, the last-passage algorithm was...

Aiming at some problems exposed in Huatugou oilfield during the development process, such as the imperfect injection-production pattern in some area, the low corresponding rate between oil and injection wells, the low control and producing degree, the poor effect of the water flooding and so on. Starting...

The objective of concealed weapon detection is to detect and recognize individuals or groups of terrorists in public areas, such as airports, trains, railways, and even malls. This work investigates how the lives of people in crowded areas can be protected with respect to humanitarian privacy. Seismic...

It is commonly believed that the fatigue life and cyclic stress is logarithm linear dependence when fitting P-S-N curve, but data of fatigue tests indicate that the linear correlation isn't evident for ultrahigh strength sucker rod. It is necessary to present a new fitting method. The scatter diagram...

Now the modular mechanical water treatment technology is a new kind of technology in water treatment. The new technology has changed the work way of conventional water plants and got very wide use in practice. In this paper, the strength and deformation of filter systems which includes filter frames...

In recent decades, Fiber Reinforced Polymer / Plastic (FRP) has been successfully applied in varieties of structures due to its lightweight, high strength and corrosion resistance properties. In this paper, we developed a finite element model to predict the behavior of a 1.5 MW GFRP wind turbine tower...

Many cutting errors cause micro drills breakage in a kind of complex stress state under loaded by thrust, torque and radial force. It is important to research the breakage mechanism of micro drills and prevent from breakage during micro drilling. In this paper, a 3D micro drill is modeled by using the...

LS-DYNA finite element software was used to set up the computational model of fragment oblique penetration on circular tube, the dynamic process of cylindrical, spherical and cubic fragment penetration on circular tube was simulated under different working conditions, acquired the damage characteristics...

The high precision detecting circuit is designed for the KELLER 3L sensor which is the pressure-resistance pressure sensor, and the water level long time monitoring of groundwater is accomplished. Through designing the power management circuit, the pressure sensor driver circuit, the signal conditioning...

This paper introduces a research methods of platinum thermal resistance signal conditioning module to long distance temperature measuring instrument. Mainly used ADT70 to turned the PT1000 platinum resistance temperature sensor resistance change when the temperature change into a voltage signal output.,...

The security shell of coal mine rescue capsule may be hit by the explosive in tunnel. We used the finite element software to established a model of security shell including three layers. The middle layer is made by rubber. Multiple simulation experiments on the buffering effect of rubber has been carried...

Finite element analysis software is used in this paper to analyze the strength of frame of high-performance low-speed diesel engine. Firstly, the former structure, single-butterfly plate, was changed into a new one, double-butterfly plate. Then, the finite element models were built, and the stress and...

The hybrid atomistic-continuum (HAC) simulation based on geometric coupling has intrinsic load imbalance under conventional parallel decomposition method. This paper presents qualitative guiding rules for alleviating load imbalance in the HAC simulation. We reveal the intrinsic load imbalance in the...

An interior booming noise issue occurred during a development stage of an HEV program. Based on the noise generation mechanism, the root cause analyses were carried out. It is found that the interior booming noise was mainly induced by the excessive second order noise from the exhaust tail pipe. The...

prevent the numerical instabilities about checkerboards, mesh-dependency and gray-scale elements in structural topology optimization with strain energy constraints, an improved ICM method based on the bi-directional filter function is presented. The sequential quadratic approximate algorithm is applied...

Because the static strength theory can't reflect exactly the dynamic loads suffered by gear box, it is difficult to analysis the gear box's reliability and rest life prediction with the short time and the complex task profile. In the paper, collaborative simulation based on interfaces is used in gear...

To analysis of contact interaction between barrel and projectile, its finite element calculation formulas were deduced on the base of contact theory. By using the new method and finite element model, the contact interaction between barrel and projectile of a rifle was calculated. The calculation results...

Real vehicle tests for equipment cannot get steady signal, and the traditional vibration test method cannot realize noncontact, without disassembly and spoil the disadvantages of the on-line detection, using the transient acoustic signal is proposed for bearing fault diagnosis. Rough set theory is a...

Compaction quality is an important part of quality assessment of earth-rock dam. Current evaluation methods tend to use the graphical reports of compaction parameters based on real-time compaction monitoring system, or built compaction quality prediction model, such as the multiple linear regression...

A stability experimental method of ground and air resonance for bearingless rotor on test-bed was investigated, the test principle and method were presented. A 4-m diameter rotor model was used to investigate aeromechanical stability of ground and air resonance and the results were compared to theory,...